package test3;

import java.math.BigInteger;

public class Demo6 {
    public static void main(String[] args) {
        BigInteger big = new BigInteger( "1");
        BigInteger big2 = new BigInteger( "2");
        BigInteger big3=new BigInteger("0");
        for(int i=0;i<64;i++){
            big3 = big3.add(big);
           big = big.multiply(big2);

        }
        System.out.println(big3);
    }
}
